KR20070006434A - Recording pulse type modification method for optical disc recordimg apparatus - Google Patents

Abstract

A recording pulse changing method of an optical disc device is provided to change the recording pulse into the non-multi pulse type when the recording power is increased above a power margin. When an optical disc such as a DVD(Digital Video Disc)-R(Recordable) is seated, an OPC(Optimum Power Calibration) operation is performed through a PCA area of the corresponding optical disc(S10). As a result of the OPC operation, the optimum recording power is determined and recorded in a user area(S11). At the state, when the input data are converted into a recordable data format by a digital recording signal processing member and again converted into the bit stream by a channel bit encoder, data are recorded in a program area of the optical disc with a multi pulse method having the optimum recording power(S12).

Description

How to change the recording pulse of an optical disk device {RECORDING PULSE TYPE MODIFICATION METHOD FOR OPTICAL DISC RECORDIMG APPARATUS}

1 is a diagram illustrating a general multi-pulse method and a non-multi-pulse method;

2 is a diagram showing the configuration of an optical disk apparatus to which the recording pulse changing method of the present invention is applied;

3 is a view showing a characteristic curve for explaining a change in a recording pulse method according to a state in which a recording power value reaches a power margin according to the present invention;

4 is a flowchart for explaining the operation of the recording pulse changing method of the optical disk apparatus according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: optical disc, 20: optical pickup,

30a: digital recording signal processing section, 30b: digital reproduction signal processing section,

40: channel bit encoder, 41: optical driver,

50: RF signal processing unit, 60: servo unit,

61: servo drive unit, 70: current detector,

80: microcomputer, 81: memory.

The present invention relates to a recording pulse changing method of an optical disk device, and more particularly, to a recording pulse in a multi pulse method or a non-multi pulse method according to a change state of recording power in an optical disk device. The present invention relates to a recording pulse changing method of an optical disk device which enables a change to record data.

In general, in a method of recording a signal by irradiating a laser light of a predetermined recording power to an optical disc such as a DVD-R that can be written only once or a rewritable DVD-RW, etc., the thermal effect of the laser light is recorded when the predetermined signal is written onto the optical disc. A write strategy is applied to prevent the shape of the recording portion from being distorted due to transmission.

In other words, when the laser light corresponding to the signal to be recorded on the optical disk is irradiated to the recording unit of the optical disk, the temperature of the rear end of the recording unit is increased by gradual heating of the recording unit and the recording power of the recording unit is maintained even though the recording power of the same laser is maintained. The width gradually increases and eventually the shape of the recording part is distorted. In order to solve this problem, after recording the head of the recording part, a short pulse laser is applied to the subsequent part to prevent the rear shape of the recording part from being distorted. Write strategy (Multi Pulse Write Strategy) is used.

As shown in Fig. 1, one top pulse Top and two multi-pulses mp are used as a pulse period corresponding to a recording pattern having a reference clock period of " 5T " One pulse per " 1T " is associated with each other, wherein the top pulse Top corresponds to a long pulse of a certain shape, and each multi-pulse (mp) corresponds to one pulse per " 1T ".

In the multi-pulse method, a top pulse (Top) and a multi pulse (mp) are generated by repeatedly turning on / off an application state of a driving current applied to a laser diode, and a multi-pulse following the application of the top pulse (Top) Through the application of mp), recording pits of a certain type are formed in the recording section of the optical disc.

In Fig. 1, in the case of the non-multi-pulse system, a single recording pulse is applied to the recording unit in correspondence with the recording pattern period of " 5T ". The power is increased so that the shape of the recording pit formed in the recording portion of the optical disc is generated uniformly.

In the case of an optical disc capable of rewritable rewriting such as DVD-RW, data can be recorded using only the multi-pulse method. However, in the case of DVD-R, both multi-pulse and non-multi-pulse methods can be used. It is.

On the other hand, in the case where data is recorded on the optical disc using the multi-pulse method in the optical disc apparatus, if the temperature rises due to peripheral factors such as high speed rotation of the optical disc, the recording power of the optical pickup increases in response to such temperature rise. If the recording power is increased while using the multi-pulse method in which the applied current of the laser diode must be repeatedly turned on / off to generate the multi-pulse, the lifetime of the laser diode, degradation of the set or data may be reduced. Problems such as deterioration of the recording quality of the optical disk to be recorded may occur.

Accordingly, the present invention has been made in view of the above-described conventional circumstances, and an object thereof is to provide a non-multi-pulse method when the recording power rises above the power margin in the state of recording data on an optical disc in a multi-pulse method. The present invention provides a recording pulse changing method of an optical disk apparatus which enables the recording pulse to be changed.

According to the present invention for achieving the above object, there is provided a method of recording data on an optical disc in which a plurality of recording methods are all available, the method comprising: detecting a current recording power value in a state in which data is recorded in a first recording method; And determining a state of changing the recording method from the first recording method to the second recording method according to whether the detected current recording power value reaches a specific power limit point. Provides a method of changing the recording pulse.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

That is, Fig. 2 is a diagram showing the configuration of an optical disk apparatus to which the recording pulse changing method of the present invention is applied.

As shown in Fig. 2, the optical disk apparatus according to the present invention is an optical disk 10 that is irradiated with laser light having a predetermined recording power to the optical disk 10 to record data or to read a signal recorded on the optical disk 10 from the reflected light of the laser light. The pickup 20, a digital recording signal processor 30a for adding an error correction code (ECC) to the input digital data, and converting the binary signal reproduced from the optical disc 10 into an original video / A digital reproduction signal processor 30b for restoring and outputting the audio data, a channel bit encoder 40 for reconverting the data converted into the recordable format into a bit stream, and optically driving the light quantity driving signal according to the bit stream signal. 20) filter the signals from the optical driver 41 and the optical disk 10 read out from the optical pickup 20, and output them as binary signals. Focusing / tracking servo of the optical pickup 20 and rotational drive of the optical disc 10 by the RF signal processing unit 50, the focusing error signal FE and the tracking error signal TE from the optical pickup 20. Is applied to generate a recording power to the servo unit 60 for controlling the rotation, the servo driver 61 for controlling the rotation of the spindle motor 62 by the servo operation of the servo unit 60, and the optical pickup 20. The recording power is increased by the operating current value detected by the current detector 70 in the state of recording data in the multi-pulse method on the current detector 70 and the optical disk 10 for detecting the operating current. When a state of rising above Margin is detected, for example, an EEPROM which stores a data value of a microcomputer 80 for changing the data recording method to a non-multipulse method and an operating current margin corresponding to the power margin of the recording power; Such as nonvolatile meth It is composed of a memory 81 made of memory.

As illustrated in FIG. 3, in the state of recording data at the optimal recording power Po, even if the temperature inside the set rises (that is, rises from X ° C to Y ° C), the same modulation degree value m is obtained. It is possible to increase the operating current for this purpose.However, when the operating current rises to the dangerous current (Icrit) range, it is difficult to know the sudden change of the modulation degree according to the graph characteristic between the modulation value and the recording power. When the temperature inside the set rises (ie, rises from X ° C. to Y ° C.), even if a dangerous current Icrit is applied, it may rise to a maximum power P max value corresponding to a power margin of 40 mW, for example.

Therefore, when the operating current detected from the current detector 70 rises to the dangerous current Ictrit range, it is found that the current recording power is greater than or equal to the power margin, so that the laser diode LD of the optical pickup 20 By changing the recording pulse method from the multi-pulse method to the non-multi-pulse method so that data is recorded.

Next, FIG. 4 is a flowchart for explaining the operation of the recording pulse changing method of the optical disk apparatus according to the present invention.

Hereinafter, the flowchart according to the embodiment of the present invention shown in FIG. 4 will be described in detail in parallel with the operation of the apparatus of FIG. 2.

First, when an optical disc 10 such as a DVD-R capable of using both a multi-pulse method and a non-multi pulse method is mounted, an OPC operation is performed through a PCA area of the corresponding optical disc 10 (step S10). ), The optimal recording power is determined as the result of performing the OPC operation and recorded in the user area (step S11).

In this state, when the input data is converted into a recordable data format by the digital recording signal processing section 30a and reconverted into a bit stream by the channel bit encoder 40, the optical pickup 41 drives the optical pickup 41 to drive the optical pickup. In step 20, data can be recorded in a program area of the optical disc 10 in a multi-pulse manner having an optimal recording power (step S12).

On the other hand, when the microcomputer 80 detects an operating current applied to the optical pickup 20 by the current detector 70 in the state of recording data on the optical disk 10, the detected operating current value is determined. It is detected whether the operating current corresponding to the power margin rises (step S13).

On the other hand, the microcomputer 80 determines whether the detected operating current value rises to the dangerous current Icrit range as illustrated in FIG. 3 to determine whether the recording power reaches the power margin (step S14). If it is determined that the recording power reaches the power margin, the recording pulse method is changed from the multi-pulse method to the non-multi pulse method (step S15), and subsequent recording data is recorded in the non-multi pulse method (step S16).

As described above, when data is recorded in the multi-pulse method and the non-multi-pulse method, only one pulse can be generated without repeatedly turning on or off the laser diode to generate the multi-pulse, thereby increasing the temperature. Even if the recording power value increases due to the factor, the laser diode is not overwhelmed.

However, if it is determined that the recording power value has not reached the power margin, the multi-pulse method is maintained as it is so that data can be recorded (step S17).

On the other hand, the present invention is not limited to the above-described typical preferred embodiments, but can be carried out in various ways without departing from the gist of the present invention, various modifications, alterations, substitutions or additions are common in the art Those who have knowledge will easily understand. If the implementation by such improvement, change, replacement or addition falls within the scope of the appended claims, the technical idea should also be regarded as belonging to the present invention.

As described above, according to the present invention, when data is recorded in the multi-pulse method on an optical disk in which both the multi-pulse method and the non-multi-pulse method are available, the operating current applied to the optical pickup is detected, and the operating current is recorded. When the power is increased to the current range corresponding to the power margin of the power, the multi-pulse method can be changed to a non-multi method to record data, so that even if the recording power rises above the power margin due to factors such as temperature rise, The change from the pulse method to the non-multi pulse method makes it possible to prevent the life of the laser diode from being deteriorated or the deterioration of the set, and the recording quality of the optical disk on which data is recorded can be improved.

Claims (3)

In the method for recording data on an optical disc in which a plurality of recording methods are all available, Detecting a current recording power value in a state in which data is recorded in the first recording method; And a second step of determining a state of changing a recording method from the first recording method to the second recording method according to whether the detected current recording power value reaches a specific power limit point. How to change the recording pulse. The method of claim 1, The first step includes detecting an operating current applied to an optical pickup to generate recording power to the optical disc; Calculating a current recording power value from the detected operating current value, and determining whether the operating current value rises to a dangerous current range corresponding to a specific power threshold of the recording power. How to change the recording pulse. The method of claim 1, In the first step, the first recording method corresponds to a multi pulse method, and the second recording method corresponds to a non-multi pulse method. How to change the pulse.

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